Merv, Funny you should ask.
I am currently working on a hardtop for my RMC, which of course is the same as a Harrison.
My hardtop started as a Homebush (... shhh Homebush is also a flopped RMC) but I didn't like it. You know what happens when you don't like something on your cobra ... you re-make it.
All hardtops involve a
LOT of work to fit and you will need be comfortable in fibreglass laminating.
Actually, what might be better for you is there is a cobra owner in your neck of the woods who only recently took a basic mold off my hardtop.
I do have this fellows contact and I will seek permission to pass on his details.
Give me a call if you still have my number.
Cheers